Karl,
Just curiosity - what is the origin of video recorder and video tape used by
greenpeace people ???
For their sake I believe it were manufactured far away from any suspitions
of circumstances where environment eventually could be polluted.
Regards
Edward
> -----Original Message-----
> From: Karl Heinz Zuber [SMTP:[log in to unmask]]
> Sent: á éĺěé 19 2004 10:39
> To: [log in to unmask]
> Subject: [LF] AW: [LF] "lead vapors" myth
>
> Dear Friends,
> if you are interested in Chinese recycling work conditions, please
> contact greenpeace, they have, among other things, a video about that
> which is very impressive. Of course, lead is not the only or even the
> biggest problem for them. I assume that under the given circumstances,
> vapors as well as particular lead will occur.
>
> I think I could send the video to interested persons; but you should
> first try to get it from Greenpeace, i dont know if its available at the
> internet. Probably you dont trust these silly "environmentalists", but
> when i see the situation in china or india, i think its important to
> have somebody who cares about that. The superior, clean technology that
> solves all problems is a "myth", too, for most parts of the world.
>
> On the other hand, this is a good example, that "recycling" is not the
> "panacea" to cure all potential environmental problems, as it was
> suggested several times in this forum.
>
> As to the "nontoxic metallic lead", it is not inert enough to expose it
> to environmental conditions or biological processes withhout effect.
> (refer to MERIAN "Metals and their compounds in the environment").
> As to the threshold problem, we discussed it earlier; it is not
> applicable for genotoxic effects. Also, an assumed threshold is not to
> be seen as an "aim" for pollution that should be reached. There should
> allways be a safety factor, because you practically cannot determine,
> what exactly will happen to a substance in environment.
>
> Best regards,
> khz
>
>
> -----Ursprüngliche Nachricht-----
> Von: Leadfree [mailto:[log in to unmask]] Im Auftrag von Brian Ellis
> Gesendet: Sonntag, 18. Juli 2004 09:50
> An: [log in to unmask]
> Betreff: Re: [LF] "lead vapors" myth
>
>
> As far as I'm aware, metallic lead is not toxic per se, because it
> cannot be metabolised. It is the lead compounds, starting with the
> various oxides, that are toxic. That having been said, airborne lead
> particles could be easily oxidised and sulfided. It should also be
> mentioned that lead is not absent from the so-called "cosmic dust" or
> micrometeoroids. In fact, scientists use the U:Pb ratio of these to
> determine their age and origin. I cannot state the quantities but it is
> not insignificant.
>
> One thing that should be realised is that the toxic effects of lead (and
> most other elements and compounds) are not linear. There is a threshold,
> below which the effect is negligible. Above the threshold, the effect
> can follow a law with an exponent of the mass absorbed of anything
> between 1 and 2.
>
> Another popular myth is that the toxic effects of lead are irreversible.
> Sure, brain cells that have already been destroyed cannot be regenerated
> but long term treatment with calcium EDTA and penicillamine will remove
> the lead from the system and prevent further damage; at the same time,
> it will eliminate all the other symptoms of plumbism (painful
> gastrointestinal degradation, reduction of haemoglobin production
> causing anaemia, gum disease etc.), which often kick in before severe
> mental deterioration.
>
> Brian
>
> MA/NY DDave wrote:
> > Hi Again IEEE-Harvey, Gordon, and IPC LF Listservers,
> >
> > A little add to your CA-Toxic Group, Alcatel-person, Chineese workers
> tread.
> >
> > Be careful if they are pulverizing or creating SnPb dust (Is the
> bottom
> > line). By the Way this will probably not be specific to SnPb.
> >
> > In my early reading of the book I noted previously, from the
> professors at
> > the Univ of Naples (Castellino), it seems that particulate lead is the
> main
> > culprit for lead airborne intoxication and metabolism in organisms.
> Gordon
> > has been focussed on the gas state and it's effects yet maybe it is
> the
> > solid state in small particles that is the difficulty for plants and
> us
> > ANimals. Gordon did note this in his note.
> >
> > For Airborne Lead there is a base level almost without humans on-board
> that
> > was estimated by a person named Nriagu. It comes from natural
> particulate
> > matter sources (also known as dust). 24.5 x 10*3 tons would be a base
> level
> > without some of man's adds. Due to us all going into the metal age
> (bronze
> > age I think) we have added a pile of Lead and many more metals. I
> guess my
> > point is that even though we have added metals significantly to our
> > ecosystem they would be there at some level anyway.
> >
> > So, Again I don't know the issues behind what you posted or the agenda
> or
> > knowledge of those you noted, yet I wanted to give a little bit more
> > ammunition to engage the discussion and continue the learning.
> >
> >
> >
> > Yours in Engineering, Dave
> > Y i Engr, MA/NY DDave
> >
> >
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